Compound mold for forming



2 Sheets-Sheet 1.

J. HENNY & A PEDERQUIST. COMPOUND MOLD FOR FORMING INOANDESOENT LAMPBASES.

No. 558,070. Patented fipy igl, 1896.

i (No Model.)

WITNESSES- h V Mam Modem A 2 Sheets- Sheet 2.

J. BENNY & A; PEDERQUIST. GOMPQU ND MOLD FOR FORMING INGANDESGBNT LAMPBA$ES. N0. 558,070.

' PatentedApr. 14, 1896.

UNITED -STATES.

PATENT OFFICE.

JACOB I-IENNY AND AUGUST PEDERQUIST, OF SCHENECTADY, N EWV YORK,ASSIGNORS TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

COMPOUND MOLD FORFORMING.INCANDESCENT-LAMP BASES.

SPECIFICATION forming part of Letters Patent No. 558,070, dated April14, 1896. Application filed November 29, 1895. Serial No. 570,344. (Nomodel.)

To all whom it may concern:

Be it known that we, JACOB HENNY and AUeUsT PEDERQUIST, citizens of theUnited States, residing at Schenectady, county of 5 Schenectady, Stateof New York, have invented a Compound Mold for Forming Incandescent-LampBases, of which the following is a specification.

This invention relates to compound molds for forming insulating-blocksfor incandescent-lamp sockets.

I-Ieretofore in making insulating-blocks for incandescentdamp sockets ithas been necessary to weigh the plastic porcelain or other insulatingmaterial of which the block is formed, and considerable care and skillhad to be exercised not only in providing the exact amount of plasticinsulating material, which is compressed to the required and propersize, but also in forming the grooves for the screws, by means of whichthe cap is secured to the block, which grooves were re quired to be madeof proper and exact size in order to properly engage the cap with theblock. The weighing of the plastic mass and the measurement of thegrooves are obviated by simultaneously compressing the plastic mass andforming the grooves by means of a die constructed as hereinafter setforth and claimed.

Referring to the accompanying drawings, Figure 1 is a view inperspective of the upper die in an inverse position. Fig. 2 is aperspective view of the base, the casing and lower die projectingtherefrom. Fig. 3 is an enlarged plan view of the bottom of the upperdie. Fig. 4 is an enlarged side view of the upper die in longitudinalsection on the line a a of Fig. 3. Fig. 5 is a plan view of the lowerdie and its casing. Fig. 6 is a side view of a portion of the casing andthe lower die in longitudinal section on the line b b of Fig. 5. Fig. 7is an enlarged view of the entire compound mold, showing the casing,lower die, and head of the upper die in vertical section. Fig. 8 is adetail view thereof in vertical section.

The compound mold is constructed as follows: 1 indicates a suitablebase, upon which 50 is mounted the casing 2, formed with a @611 tralcircular cavity 3, in which is located and adapted to reciprocate thelower die 4. The diameter of the cavity 3 and the lower die 4 i will beof the size desired for the insulatingblock. The height of the lowerdie4 will be abouthalfthe depth of the cavity 3, as indicated in Fig. 7.1 The lower die 4is mounted up through an opening in thebottom of thecasing 2 and reciprocates therein and is operated by a suitablemechanism. Thelower die 4 is formed with the side grooves 6, ex-

their lower ends and located in the lower ends of grooves 8 in-the sideof the lower die 4 and adapted to be pressed into the grooves 8, asshown more particularly in Fig. 8, and also provided with a taperingcircular projection .9 at their outer ends, the latter extendingsomewhat above the top of the lower die.

Normally, as shown in Figs. 2 and 5, the elastic strips or springarms 7extend upwardly at an angle to the lower die 4. These spring-arms 7 areimportant inthat by means of them holes or recesses for pins or screwsmay automatically be formed in the side of the insulating-base at anaccurate distance from the end of the base without measurement, thusaflfording a great saving in time, labor, and expense. The lower die 4is also formed with pr jections 10, which are provided with circul holesor passage-ways extending from end t end of the lower compound mold. Inthe Qfittom of the cavity3 of the casing 2 are moun ed pins or rods 11in alinement with the holes in projections 10 and of such a length thaten the lower die tend through the die 4 and e tend up to the on theupper end of the rod 5, which passes 4 is at the bottom of cavity 3thgexptiis 11 will ex- 5 top of the cavity 3. By this me plastic mass iscompressed between the dies, the rods 11 extend through the and form thedesired holes.

pla tic mass s, when the IOO It will be noticed that the upper ends ofthe side grooves 6 are formed with inwardly-tapering curved projections12 to provide proper cavities for the inslulating-block. The top of thelower die 4 is also provided with a slight flange 13,which forms ashoulder for one end of the insulating-block. In conjunction with thelower die 4 is employed an upper die 14,mounted on the end of a shaft15, which is operated by suitable mechanism. The upper die 14 isprovided with the side grooves 16, extending vertically from end to endthereof, the said grooves 16 being in alinement with the side grooves 6in the lower die 4 and engaging projections 6 when the die is inoperation, as will hereinafter be set forth. The upper die 14 is alsoformed with suitable deep cavities 1'7, the transverse projection 18 andprojections 19 and 20 conforming to the desired projections, cavities,and shouldered portions contributing to make up the proper shape of theinsulatin gbase. The upper die 14 is also formed with the perforations21 in alinement with the perforations or apertures 10 in the lower dieand with vertical slots or grooves 22 in alinement with guides 23 in thelower die 4, adapted to engage the guides 23 when the die 14 is lowered.These perforations 21 are employed in conjunction with the rods 11,mounted in the cavity 3 to form the necessary holes through theinsulating base, as hereinbefore mentioned;

I The die is operated as follows: The lower die 4 is drawn down to thebottom of the cavity 3 to the position shown in Fig. 7. A suitableamount of plastic porcelain is then placed on top of the lower die 4 andthe upper die 14 brought down against the top of the plastic mass in thecavity 3, causing the rods 11 to make holes through the plastic mass,the rods 11 becominglocated in the holes 10 and 21. It will be noticedthat when the lower die 4 is drawn down to the bottom of the cavity 3the spring-arms '7, being drawn against the inner sides of the cavity 3,will be pressed forward into the grooves 8, so that the projections 9will extend over the top of the lower die 4. As the upper die descendsthe grooves 22 engage guides 23 in the rcceptable WVhen the plastic massis pressed against the lower die 4, the projections 9 will be pushedinto and embedded in the plastic mass. As the upper die is withdrawn andthe lower die raised the arms 7 automatically spring outward and theprojections 9 are released from the molded piece or insulating-block,leaving side cavities for the purpose of engaging by screws the shellwith the base. As the upper die 14 is pressed down'against the plasticmass the projections 6 in the sides of the cavity 3 will form the sidegrooves in the molded i11- sulating-block, the plastic mass pushed upthereby being forced into the side grooves 16 of the upper die. Theseveral desired projcctions and cavities will be formed in the upper andlower ends and sides of the insulatingblock by the several cavities andprojections in the upper and lower dies being pressed into the plasticmass.

By means of this device an insulating-base for incandescent-lamp socketsmay be compactly and quickly formed of the desired size and withcavities, holes, and projections of the proper dimensions, as referredto at the beginning of the description.

lVhat we claim is- 1. In a compound mold for making insulating-bases forincandescent lamps, the combi nation with a lower die having pins, of anupper die formed with cavities and projections on one end and verticalside grooves to form projections and cavities of the insulating-base,and perforations in the said end of the die to receive pins projectingfrom the lower die. I

2. In a compound mold for making insulating-bases for incandescentlamps, the combination with an upper die having perforations, of a lowerdie formed with projections,- and a flanged edge to give the desiredshape for the insulating-block, perforations extending verticallythrough the die for the passage of pins, vertical side grooves, andspring-arms fastened at their lower ends in said grooves, extending atan angle to the die above the latter, with inward projections adjacentto their outer ends and adapted to be moved into said grooves.

3. In a compound mold for making insulating-bases for incandescentlamps, an upper die having perforations in combination with a receptaclehaving vertical guides on its inner walls and pins projecting upwardfrom its IOO bottom to the top of the receptacle, and with e a lower dievertically movable in said receptacle and formed with vertical sidegrooves engaging said guides, perforations through which said pinsproject, vertical grooves in the side of the die and spring-arms securedat their lower ends in said grooves and having an inward projectionadjacent to their upper ends, the latter projecting above the die andthe spring-arms located at an angle to the die and movable into saidgroove, and projections and a circular flange at one end of the die forgiving the desired shape to the insulatingbase.

4. In a compound mold for making insulating-bases for incandescentlamps, an upper die having perforations in combination with a receptaclecontaining vertical pins for forming holes in the insulating-base, and alower die movable vertically in said receptacle on said pins andprovided with vertical side grooves and spring-arms secured in andmovable into said grooves, extending outwardly at an angle to said dieand above the latter, and having inward projections adjacent to the topof said arms.

5. In a compound mold for making insulating-bases for incandescentlamps, an upper die with perforations in combination with a lower dieprovided with vertical side grooves an d spring-arms secured at theirlower ends in IIC said grooves, extending above the top of-the die withan inward projection at their upper top of the lower die with inwardprojections at their upper ends, said spring-arms being I5 movable intoand-out of said grooves by the movement of the die, in combination withan upper die with perforations adapted to move down on the pins in thereceptacle.

In witness whereof we have hereunto set our 20 hands this 21st day ofNovember, 1895.

JACOB HENN Y. AUGUST PEDERQUIST. Witnesses:

B. BQHINE, O. L. HAYNES.

